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Lecture

Lecture 25.docx

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Department
Biology
Course
Biology 1002B
Professor
Tom Haffie
Semester
Winter

Description
Lecture 25: Life as a Complex system  Step by Step…  If you were an ADP molecule…  Clicker question o Imagine that you are an ADP molecule inside a bacterial cell o How would you manage to “find” an ATP synthase so that you could become an ATP molecule  X  Our minds tend to explain patterns by “direct causal schemata” o One thing happens after another  Step by step… o These schema don’t apply everywhere  However, some patterns requires us to develop “emergent causal schemata” o Behaviour of flock (birds), is emerges  Diffusion is emergent rather than causal… o There is a dance floor with two rooms with a connection to both, people are dancing (acting random) o If we put red hats on the left hand side o The red hats will be distributed throughout the room o The proportion of the red hatted people in the centre will fluctuate at random, goes up and down  No direct causal to make them to move  The behaviour of the system emerges from the  Look at chart in powerpoint o Difference between direct schema and emergent schema o Emergent  Nothing in control, no leader  Pattern arises from net effect of all interactions  Emergence… o Characteristics of the whole are not predictable by knowledge of the parts o The whole is greater than the sum of its parts  So far… o Emergence is an explanatory schema  Simple systems o Few parts o Defined relationship o High predictability  Like putting furniture together  Complicated system o Many parts o Defined relationships o Highly controlled o Sequential o High predictability  Complicated system (termites mound) o Many parts o Changing relationships o No central control o Self-organized o Emergent patterns (1/f) o Low predictability  In a complex system, the agents can change each other when they interact  “1/f” patterns (power laws) arise in complex systems o White noise contain equal wavelength o Pink noise contain different wavelengths o Long wavelength uncommon, short wavelengths are common  Zipf’s Law o “1/f” patterns in language o Language arises from a complex system  Traffic jams o Traffic jams show a “1/f” frequency distribution characteristic self-organizing complex system o Jams of all sizes are an emergent feature resulting from n
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